66515116151489 has 2 divisors, whose sum is σ = 66515116151490. Its totient is φ = 66515116151488.

The previous prime is 66515116151479. The next prime is 66515116151579. The reversal of 66515116151489 is 98415161151566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45875967312400 + 20639148839089 = 6773180^2 + 4543033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66515116151489 is a prime.

It is not a weakly prime, because it can be changed into another prime (66515116151479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33257558075744 + 33257558075745.

It is an arithmetic number, because the mean of its divisors is an integer number (33257558075745).

Almost surely, 2^{66515116151489} is an apocalyptic number.

It is an amenable number.

66515116151489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66515116151489 is an equidigital number, since it uses as much as digits as its factorization.

66515116151489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776000, while the sum is 59.

The spelling of 66515116151489 in words is "sixty-six trillion, five hundred fifteen billion, one hundred sixteen million, one hundred fifty-one thousand, four hundred eighty-nine".